v. t. 1. To mark a line below, as words; to underscore. [ 1913 Webster ]
2. To influence secretly. [ Obs. ] Sir H. Wotton. [ 1913 Webster ]
3. Emphasize or call attention to; highlight; as, Long waits at the emergency room underline the need for a larger hospital. . [ JG ]
n. [ Under + -ling. ] 1. An inferior person or agent; a subordinate; a low-ranking employee. Milton. [ 1913 Webster ]
2. Hence, A mean, sorry fellow. Milton. [ 1913 Webster ]
The fault, dear Brutus, is not in our stars, But in ourselves, that we are underlings. Shak. [ 1913 Webster ]